I managed to use archive.org to find the installer for version 4.5.6 but even when it was successfully installed on Windows XP Pro 64-bit, the app can’t find the server because I guess you disabled all previous versions from working. So I’m going the GitHub route to download winapp2.ini from https://github.com/MoscaDotTo/Winapp2 (I think that’s where you get yours from anyway).
I’ll continue using CCEnhancer on my Windows 10 Pro 64-bit machine. Works beautifully there.